Keystones — Capstone
Five GCSE retrieval questions · 17 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√32
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 5x + 8
Answer: (x + 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 66°. Give your answer to 2 decimal places
Answer: 147.99cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 20:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 50, 84, 77, 67, 22, 67, 92, 21. Give your answer to 2 decimal places
Answer: Mean = 60.33, Median = 67, Range = 71